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vesna_86 [32]
3 years ago
9

During two years, the population of birds of an island became 7 times more than before. If the first year increase in the popula

tion was 40% , what was the percent increase of the second year?
Mathematics
1 answer:
nordsb [41]3 years ago
6 0

Answer:

The percent increase of the second year is 400%.

Step-by-step explanation:

Consider the provided information.

Let the population of birds was x.

After 2 years the population becomes 7 times more than before.

Therefore, after 2 years population is 7x.

In first year increase in the population was 40%.

Population after 1st year = x + 40% of x

Population after 1st year = x + 0.40x

Population after 1st year = 1.4x

The population increase from 1st year to 2nd year is: 7x-1.4x=5.6x

Thus the percentage increase is:

\% increase=\frac{5.6x}{1.4x}\times100=400\%

Hence, in second year the population of birds increase by 400%.

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  All proportions have <u>this</u> <u>form</u>:

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